All 10 suspects are charged with acting as agents of a foreign government, and nine are also charged with conspiracy to commit money laundering.

Among the phony identities taken by the alleged spies are those of dead Americans, officials said.

All are scheduled to appear in court Monday in New York, Boston, Massachusetts, and Alexandria, Virginia.

A total of 11 defendants -- including the 10 arrested -- have been charged in two separate criminal complaints. One defendant is still at large, according to the Justice Department.

The defendants have been charged with conspiracy to act as an agent of a foreign government without notifying the U.S. attorney general, a crime that carries a maximum penalty of five years in prison, the Justice Department said. Conspiracy to commit money laundering has a maximum penalty of 20 years in prison.

The case against the alleged spies, according to the statement, is the result of a "multiyear investigation" conducted by the FBI, the U.S. Attorney's Office for the Southern District of New York and the Justice Department's National Security Division.

A Russian embassy spokesman said on Monday that he was unaware of the reports on the arrests, and said he is seeking more information from Russian officials.

Given the long-term investagation, it is hard to doubt. The FBI was all over them. Entered their houses numerous times to take photos of documents, followed several to South America, had audio recording of their houses...coding messages, etc.